The volume inside the cylinders of all of the pistons in a combustion engine is typically...
The volume inside the cylinders of all of the pistons in a combustion engine is typically specified in cc (cm3). A typical 4-cylinder car engine has a cylinder volume of 3900. cm3. Immediately after ignition, the pressure in the cylinder is approximately 125 atm and the temperature is 320. °C. Assuming the gas mixture in the cylinder behaves ideally, and is occupying the maximum volume of the cylinders, how many moles of gas are in the cylinders immediately after ignition?
Homework Answers
total volume of four cylinders,V = (3900 x 4) cc = 15600 cc
since
1 cc(cm3) = 1 mL
hence
15600 cc = 15600 mL = 15.6 L
Temperature,T= 320 ° C = (320 + 273.15) K = 593.15 K
Pressure, P = 125 atm
by the ideal gas equeation
PV = nRT
number of moles, n = PV/RT
= 125 * 15.6 / ( 0.0821 * 593.15 )
n = 40.04 moles
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